Furnace construction



March 14, 1933. F PR VIN A 1,901,821

FURNACE CONSTRUCTION Filed Dec. 16, 1930 Inuenior A Home y Patented Mar. 14, 1933 UNITED STATES FIRMIN PROVINCIAL, F wooNsocKET, more ISLAM) FURNACE consiuituo rioii Application filed December 16,1939: s liiiital 502,818.

This invention relates to new and useful improvements in boiler constructions, and more particularly it pertains to boilers of the type in which the fire box is formed by a suit- 5 able brick structure.

It is one of the objects of the present invention so to construct the. brick structure of a boiler of the heretofore mentioned type, that no damage will result to said brick structure upon the collection and combustion of an excess quantity of gas within the fire box of the boiler which is formed by said brick structure.

It is a further object of the invention so to construct the brick structure that relief in the case of combustion of gases will be provided.

It is a further object of the invention so to construct this relief for combustion of gases that it will not in any way interfere with the proper draft through the fire box to promote combustion.

A still further object of the invention resides in a construction whereby when the relief has operated to relieve the pressure caused by the combustion of gases in the fire box, the device will automatically return to closed position.

Other objects of the invention will become obvious as the nature of the invention is better understood, and for this purpose reference is had to the accompanying drawing in which,

Figure 1 is a view in vertical section showing one of a battery of furnaces of the type to which a device of the present invention is particularly adaptable,

Figure 2 is a detail view in elevation on a slightly enlarged scale of the device of the present invention, and;

Figure 3 is a detail sectional View taken on the line 3-3 of Figure 2.

Referring more specifically to the drawing, the fire box of the furnace is designated 5. This fire box has a grate 6 which is sup ported in any suitable manner as by brackets 7 from opposite side walls 8 of the fire box.

The fire box is formed by a brick like struc ture such as 9 having a dome or arch top 10 in which the boiler 11 is placed.

Nearthe upper portionof the fire box, I provide outlets in'the' for'm of passages 15 and'in the caseof abat'tery of furnaces, these passages'may havecommunication as designated' at 16 at the right hand portion of Figure' 1. A suitable discharge outlet 17 for thesepassages is provided. These passages have communication with the interior of their respective fire boxes, and are closed with respect thereto by means'of a swinging damper like member 18. These damperlike members 18 are pivot-ally connected or mounted as at 19 to a housing or similar box like structure 20 which is built up of suitable dimension that it may be placed within the passage and snugly fit the side walls thereof with its free open end 21 positioned adj acent the fire box.

These swinging members 18 are so mounted that they swing outwardly away from the fire box or in the direction of the exit of ases from the fire box as best illustrated in igure 1.

To limit the swinging movement of these members 18 to their open position, a suitable stop may be provided and in the present embodiment of the invention, this stop comprises an arm 25 secured to the housing as at 26 and so positioned as to be within the path of swinging movement of the members 18 as they move to their open position. For cushioning the shock incident to engagement of the stop 25 with the swinging member 18, a coil spring such as 27 may be employed and suitably connected as at 28 preferably to the free end of the arm 25.

By reference to Figure 1 of the drawing, it will be apparent that as the gas fills up in the fire box, if combustion thereof takes place, relief will be had through the passages 15, the swinging members 18 moving to their open position and .allowing the free passage of the combustible gases from the furnace and thus prevent rupture of the brick work or other damage to the furnace structure.

While the invention has been herein disclosed in a preferred form, it is to be understood that the invention is not to be limited to the specific construction herein illustrated, and that it may be carried out in other forms without departing from the spirit thereof. Having thus described the invention, what is claimed as new, and what it is desired to 6 secure by Letters Patent'of the United States,

In a brick work furnace having a combustion chamber, a metal housing. placed in a side wall of the chamber with its'inner-end in communication with the upper part of the 10 chamber and said wall having a passage therein leading from theouter -end ofthe' housing to the atmosphere, said passage having an enlarged portion in its top wall located adjacent the outer end of the housing, a gravity door hingedly connected ati't's "upper edge with the upper part of the housing at the outer end of the housing and moving-into the enlarged part of the passage upon opening movement of the door, an arm connected with' the toppart of the outer end of the housing and extending outwardly and upwardly therefrom and located in the enlarged part' of the passageand a spring depending from the outer endiof the arm and engaged by-the door-when the same is swung upwardly. V

In testimonywhereof I affixmy'signaturer a FIRMIN PROVINCIAL; 

